Telegraph printing apparatus



A. T. MAcCOY AND R. F. ALLEN. TELEGRAPH PRINTING APPARATUS.

APPLICATION FILED AUG-F1917. I 1,365,004. Patented Jan. 11, 1921.

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A. T. MAcCOY AND R. F. ALLEN.

TELEGRAPH PRINTING APPARATUS.

APPLICATION'HLED AUG. 1]

Patented Jan. 11, 1921.

5 SHEETSSHEEI 2.

A. T. MACCOY AND R. F. ALLEN.

TELEGRAPH PRINTING APPARATUS.

APPLICATION FILED Aue.11, 1917.

1,365,004. Patented Jan.11,1921.

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TELEGRAPH PRINTING APPARATUS.

APPLICATION FILED AUGJ]. 1917.

1,365,004. Patented Jan. 11,1921.

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UNITED STATES PATENT OFFICE.

ANDREW T. MACCOY, OF DOVER, AND ROY F. ALLEN, OF WHITMAN, MASSACHUSETTS, ASSIGNORS TO THE UNITED TELEGRAM COMPANY, OF BOSTON, MASSACHUSETTS,

ACORP'OBIATION on NEW JERSEY.

TELEGRAPH PRINTING APPARATUS.

Specification of Letters Patent. Patented J an. 11, 1921.

Application filed August 11, 1917. Serial No. 185,770.

Telegraph Printing Apparatus, of which the following description, in connection with the accompanying drawings, is a speci- 10 fication, like characters on the drawings representing like, parts.

This invention relates to telegraph printing apparatus and pertains more particularly to character printing apparatus for.

selectively transmitting and receiving, for

example, letter, and numeral characters or the like, giving press reports, stock quotations and similar information. The invention further consists of selective and synchronizing mechanisms for the control and operation of the printing elements. V

In order to illustrate our invention we have shown in the accompanying drawings one embodiment thereof, wherem:

Figure 1, is a plan View of a character printing apparatus of our invention for re ceiving and printing characters.

Fig. 2, is a front elevation of Fig. 1.

Fig. 3, is a left hand side elevation of ig. 4, is a right hand side elevation of Fig. 2.

Fig. 5, is an enlarged detail vertical section on line 5-.5 on Fig. 3.

Fig. 6, is a horizontal plan of a detail on line 6-6 on Fig. 2 and more fully described hereinafter.

Fig. 7, is a vertical section on line 77 on Fig. 2.

Fig. 8, is a detail vertical section on line 8-8 on Fig. 2.

Fig. 9. is a detailvertical section on line 9-9'on Fig. 2.

Fig. 10, is a horizontal section of the detail on line 101() on Fig. 5.

Figs. 11, 12 and 13 are details hereinafter described.

Fig. 14 is a diagrammatic View 'of the the generic and descriptive sense and are therefore not specifically intended for terms of limitation of our invention.

In the drawing 20 represents a character printing wheel having upon the periphery thereof numeral type faces and 21 is a similar wheel having upon the periphery alphabetical or letter type faces. Said printingwheels are mounted upon and secured to a revolubleshaft 22. Cooperating with said wheels are platen rolls or press rolls 24 and 25 respectlvely each adapted to move toward and from its cooperating roll under the influence of the press magnets 27 and 28 to bring one side or the other side of the paper tape or strip 29 to engage with the character printing wheel corresponding thereto.

The above elements 1 are representative of character printing apparatus but the details adapted to carry out the principles of operation and control of the same are in the present instance embodied in elements difsaid shaft is provided with a trunnion 37 rotatable in the counterbore at the reduced end 38 of the bearing pin 39 extending through the bore 40 through the arm 41 likewise forming part ofthe frame 32. Set screws 42 are adapted to clamp the bearing pins 34 and 39 to the arms 30 and 41 respectively and permit of longitudinal adjustment of said pins and therefore the said shaft 22.

The mechanism for rotating the shaft 22 to thereby present different characters successively to the platen wheels 24 and 25 comprises electrically operated ratchet and pawlmechanism cooperating with yielding driving devices controlled by a yieldingly driven escapement and a unisonfmechanism for maintaining synchronism with the sending ortransmitting elements or. devices and,

with other printing apparatus in circuit with the said transmitting elements.

Rotatable on the reduced portion 44 on the shaft 22 and on the reduced end 38 on the bearing pin 39 is a sleeve 45 on the left hand end of which is a ratchet 46 preferably having one half the number of ratchet teeth as there are characters distributed about the periphery of one of the character printing wheels 20 or 21. The opposite end of the said sleeve 45 is provided with a collar 47 and surrounding the former is a light torsional spring 48 having one end thereof secured to the pin 49 fixed to said sleeve. The opposite end of said spring is in engagement with a pin 52 projecting from the collar 53 secured to the shaft 22 in any suitable manner, as illustrated by the set screw 54.

Therefore the act of ratcheting the sleeve in the direction of the arrow in Figs. 1, 2, 3 and 8 will tend to wind up the spring 48 causing it to exert pressure against the pin 52 and thereby rotate the collar 53' and the shaft 22.

Rotatable between the collar 53 and a member 55 on said shaft is the hub 56 of the escapement wheel 57. A pair of stops 60 and 61 extend from the collar 53 and pass each side of the arm or spoke 62 on said escapement Wheel. A light torsional spring 64 surrounding the hub 56 is secured to the arm 62 and the stop 61 normally causes the said arm to engage with the stop 60 and drives said escapement wheel in the direction of rotation of the shaft 22. Therefore the escapement wheel is yieldingly driven and the action thereof is controlled by the spring 64 with a. limited degree of movement by reason of the arm 62 yieldingly actuated betweenthe stops 60 and 61 which are in turn yieldingly rotatedby the spring 48.

The member 55 is suitably secured to the shaft 22 preferably by means of a set screw 68. Said member is provided with an arm I 69 having a fixed relation to the starting or normal position of the type or printing 'wheels 20 and 21. The said arm extends radially from said member and is adapted to engage with or abut against the end of a movable stop hereinafter described.

The ratchet 46 is rotated by means of a pair of oppositely extending spring pawls 72 and 73 which engage said ratchet tangentiallyat diametrically opposite points and which are secure at the opposed ends of the swmging segment 75 by means of the screws 76.' Saidpawls are adapted to alternately engage w th a ratchet tooth as they are moved first in one direction and then in the other. That is, the pawl '72 engages with a ratchet tooth after the segment 75 has been moved to the right in Fig. 8, and. during the tmie said segment is moving to the left.

After the latter movement has been com pleted the pawl 73 is then located to engage a ratchet tooth at the point diametrical y opposite on the ratchet. The pawl 73 is now moved tothe right by said segment thereby rotating the ratchet the distance of another half tooth. Therefore the rotation of the said ratchet for a distance equal to one half of a tooth also rotates the printing wheels a distance equal to the circumferential displacement of one character on said wheels and presents another character to the platen rolls 24 and 25.

An arm 78 integral withand rojecting midway of the segment 75 is attac led by the screws 79 to the armature 80 pivoted at 81 to the pole 82 of a permanent magnet 83. Said armature 80 is adapted to be operated by the electromagnets 85 and 86 supported on the pole pieces 87 and 88 respectively projecting from the yoke 89 forming the opposite pole piece of the permanent magnet 83, see Figs. 1, 2 and 14.

An arm 93 secured to the opposite side of the armature 80 by means of the screws 94 carries the escapement segment 95 havlng at each end thereof pallets 96 and 97 projecting within the plane of rotation of the teeth of the escapement wheel 57 to be engaged thereby to permit first one tooth and then another on the latter to pass the pallets as said segment is moved in the well known manner. The teeth of said escapement wheel 57 are arranged in the reverse direction to that usually employed in order that the incline of the teeth when engaging with the pallets 96 and 97 and the resilient drive therefor will permit said escapement wheel to acquire momentum in its starting'movement simultaneously with the starting of rotation of the shaft 22 thereby to prevent the usual relative drag or retardation so common with the opposite arrangement of the teeth. The

escapement wheel 57 is yieldingly driven wheel 57 cause a step by step movement or Y rotation of the shaft 22 until such time as said rotation shall for any purposebe arrested. I

Obviously the s ring 48 having a. tendency to unwind an reduce the energy stored therein thereis introduced between the shaft and the driving elements some limiting means to prevent unwinding and to maintain the spring in a substantially normal condition. Therefore the sleeve 45 is 'prosaid sleeve 45 and pin 98 to continue to ro-' tate thereby further winding up the spring 48 until the pin 98 engages with the pin 52 at the rear thereof, unless the retarding or arresting means ceases to act sooner to again permit the sleeve and shaft to rotate simultaneously. Should the said shaft.22 be arrested by the pin 98 actually engaging with thepin 52 the said sleeve 45 will also cease drawn the pin 98 will immediately. move slightly to the rear of the pin 52 and'con- .tinue rotating in this position with the to rotate and the pawls 72 and 73, and the armature 80 will be held against further movement until the arresting means ceases to act. After the arrest ng means 1s wlthspring 48 under the greater tension. If the escapement wheel 57 either advances or slips a tooth beyond or from the then step or relation of the shaft 22 or if the ratchet recedes or slips, the pin 98 recedesfrom the pin 52, the spring 48 unwinds progressively and the parts gradually resume their normal relation.

A fault due to circuit or mechanical troubles in telegraph printing apparatus is that all elements do not at all times operate in unison or synchronism with'the transmitting elements or with associated printing machines in series therewith. Therefore cooperating with the arm 69 -is what may be termed a unison or synchronizing stop 100 projecting from an arm 101 depending from an oscillating shaft 102 and secured thereto by the set screw 103 in the collar 104 forming a part of said arm 101. Bearings 105 and 106 on the frame 32 and the arm 41 respectively are provided for the ends of the shaft 102 to rotate therein. i

The mechanism controlling the oscillating movements of the shaft 102, see Figs. 11 to 13 inclusive, comprises the torsional spring 107 surrounding said shaft and having one end fixed to the same at 108 and the other end fixed to the pin 109 on the hearmg 105 to. move the member 110 and the stop 100 toward theshaft 22. The lower end of the said member 110 is forked to provide between the legs of the same the notches 111 and 112 adapted to cotiperate with the stud 115 on the arm 116 forming part of the armature 117 pivoted at,118 on one end of.

the yoke 89.

Below the notch 112 the said forked portion'is prolonged and projects inwardly to form the inclined cam surface 120 adapted to be engaged by the-stud 115 when the latter is moved downward thereby forcing the member 110 and the stop 100 in the direction away from the shaft 22 .to permit the arm 69 to abut against the end of said stop or to pass the same during continued operations of the character printing wheels 20 and 21.

When the printing elements are operating.

in synchronism with'the cooperating elements the arm 69 either abuts against the end of the stop 100 when in the stopped or normalposition or passes said stop during continued or step by step movements from one selected character to another on saidprinting wheels. Therefore in'Fig. 11, the

arm 69 is in the normal position abutting against the end of the stop 100 and the armature 117 is in the down position against the pole 125 which is a prolongation of the ole 88 extending over the top of the coil86. he instant that the armature 117 is released bythe pole 125'the spring 126 having one end secured to said armature and the other notch '111 maintaining the member 110 and the stop 100 in the same or normal position as when so held when the arm 69 abutted' against the end of said stop.

If at any time when the arm 69 and the shaft 22- is rotating any excess amperage passes in the coil 86 by the means hereinafter more fully described, the armature 117 is immediately pulleddown against the pole 125 and the spring 107 will swing-the member 110 toward the shaft22 to project the stop 100 into the path of movement of the end of the arm 69 so as to arrest the same and the shaft 22. The notch lll'is now out of alinement with the stud 115 and the notch 112 is inalinement therewith so that the return path of vmovement of said stud will permit the latter to enter the notch 112v thereby to hold the stop 100 within said path of movement of said arm 69. When the arm 69 thereafter engages with said stop 100 the printing wheels are in the position adjacent to'the normal or stopping position from which the latter elements will be restored to the normal position and in synchronism with the other elements by end of the said stop.

The synchronizing mechanisms have now caused restoration of all operating parts to the normal position andthe stud 1s in the proper position so that the .return path of movement thereof will enable said stud to again enter the notch 111 at theinstant that the arm 69 leaves the normal or stopping position to again rotate. When the latter operation commences excess amperage is removed from the coil 86 permitting the spring 126 to pull the armature 117 upward until the stud115 enters the notch 111 to maintain the member 110 and the stop 100 in the aforesaid retracted or normal position while the arm 69 and the shaft 22 are rotating or until the above operations are repeated.

It will be seen further, that while a single pair of coils 85 and 86 are employed they operate jointly to rotate the character printing wheels and to maintain the rotations in synchronism with other elements herein stated or to synchronize said printing wheels if such relation is not maintained. The transmitting means and the circuits connected to the coil leads 130 and 131 for the coils 85 and 86 respectively will be set forth hereinafter with reference to Fig. 14.

The press or platen rolls 24 and 25 are pivotally mounted on the free ends 135 and 136 respectively of the levers 137 and 138 each independently pivoted on the shaft 139 fixed in the supports 140 and 141 extending from the frame 32. Besides being independently mounted for movement on said shaft 139 each of said levers 137 and 138 are independently actuated to present its respective roll to the printing wheel with which it at all times cooperates.

The means selecting one or the other of said rolls for engagement with its printing wheel consists of a slidable selector roll 143 located beneath said platen rolls and adapted to be moved axially thereof to engage one or the other of the reduced roll extensions 144 and 145 respectively. The selector roll 143 is movable axially on the stud 146 extending laterally from the actuating lever 147 projecting from front to rear of the apparatus and pivoted also on the shaft 139 at a point adjacent to the lever 137. Said actuating lever has bolted thereto at 148 the lug 149 on the hub 150 of the armature 151 which latter is at the proper times attracted by the press magnets 27 and 28, see Figs. 1 and 3. A s ring 153 having one end fastened to a stu 154 on the actuating lever 147 and the other end fastened to the stud or screw 155 on the adjustable plate 156 normally maintains said lever in the down 'or normal position after the magnets 27 and 28 release the same.

Means for limiting the degrees of upward and downward movement of the said actuating lever 147, see Figs. 1, 2 and 7, consists of adapted to contact with the free end of said lever when the latter is moved toward one or the other of said screws.

The means for positioning the selector roll 143 beneath one or the other of the roll extensions 144 or 145 is an offset bar 162 hav' ing a bifurcated portion 163, see Fig. 6, closely engaging the sides of said roll. Said bar 162 is slidable axially of the rolls 24 and 25 by reason of the slot 164 engaging the body of the stud or screw 165 and having the opposite end of the bar pivoted on the stud 166 on the swinging or positioning lever 167 pivoted at 168 on the permanent magnet yoke 89. The opposite end of said lever 167 is provided with a polarized armature 169 adapted to be attracted by one or'the other of the extension pole pieces 171 and 1'72 on the press magnets 27 and 28 respectively.

Therefore after the lever 167 has been attracted by one or the other of the magnets 27 or 28 the selector roll'143 is positioned as desired and any upward movement of the actuating lever 147 carries said roll with it to engage an extension to thereafter bring the roll itself with the corresponding side of the paper tape into contact with the proper printing wheel to impress a character on the said tape.

Diamagnetic faces 175 are provided on the working faces of the.poles 172 and 173 to prevent the armature 169 from sticking or freezing thereto.

The magnets 27 and 28 are connected in series by lead wires 176 and 177 respectively which are provided to be connected with the operating circuits hereinafter described.

The press magnets operate the armatures I main in engagement with the pole with which it is in contact and the magnets are energized so as to bring about the operation only of the armature 151. Thus it will be understood that like the magnets 85 and 86 the magnets 27 and 28 may perform successively two complete functions.

The tape 29 usuallyemployed in telegraph printing apparatus is in continuous roll form generally mounted at the rear of the machine on a spindle (not. shown) upon which it is freely revoluble so as to be easily fed over the press rolls 24 and 25 and beneath the type wheels 20 and 21. From the latter said tape is brought forward over the guide way 180 between -the upright guides 181 and 182 thereon. Said guide way 180 is secured to the frame 32 by the screws 183 and is so 10- cated as to position the tape 29 centrally with respect to the said printing wheels with slightly overlapping edges extending beyond the edges of said wheels. j

'A stripper member 185 projecting between the printing wheels 20 and 21 is provided with a downwardly extended concaved face 186 to engage the top face of the. tape 29 normally to maintain the same slightly out of engagement with said printing wheels and at the same time permit either edge of the tape to be slightly deflected upward by a platen roll in order to bring the tape into printing contact with the printing wheels. Said stripper member is securely clamped to a lug on the frame 32 by means of the screw 187.

An "ink pad or roll 190 continuously in contact with the printing wheels 20 and 21 supplies the ink thereto to make the impression of the selected character on the tape 29 when the latter is brought into contact with the former. Said roll 190 is rotatable freely on the stud 191 extending from the swinging arm 192 pivoted at 193' on the frame 32. An

extension 194 rearwardly of the hub 195 on' the arm 192 has a forwardly extending lug 196 adapted to project along the inner side of a stationary stud 197 when the said roll isin the normal position in contact with the printing wheels. When the arm 192 is rotated upward until the said lug 196 can pass to the rear of the stud 197 said arm and said ink roll may be withdrawn from the pivot 193 for renewal or for reinking.

- In order to feed the tape 29 to the printing wheels 20 and 21 the actuating lever 147 is provided with a light spring pawl 199 suitably secured thereto and adapted to cooperate with the ratchet 200 integral with the sleeve 201 and a narrow feed roll 202 all of which are rotatable on the pivot 203. Therefore the downward movements 1mparted to the actuating lever 147 Wlll cause the pawl 199 to rotate the ratchet 200 and the feed wheel 202. Said feed wheel engages the extreme edge of the lower face of the tape 29 out of alinement of characters subsequently printed thereon where the serrated or knurled edge of said wheel can positively grip said" tape and not smut the freshly printed characters. A spring detent 205 adjustable by means of the clamping screw 206 which holds it securely to the guide rib 207 on the frame 32 is adapted to engage said ratchet 200 to prevent reverse rotation of the latter.

A. feed clamping wheel 208 engaging the top of the tape in alinement with the said feed wheel 202 holds the tape in positive engagement with the said feed wheel. Said clamping wheel 208 is freely rotatable on the pivot 209 extending from one end of the lever 210 the o )posite end of which is pivoted on the stu 211 rotatable in'the bearing 212 on the frame 32. A spring 213 coiled about said stud and having one end secured to the pin 2141 on the latter and. the other end hooked to the frame 32 at the rear of the bearing 212 is provided to cause said wheel anitting apparatus with circuit closing devices or keys at the central and upper p0rtions respectively and the lower portion of said figure illustrates diagrammatic details of the electrically operated parts of the character printing apparatus.

' Said circuit closing devices herein comprises a bank of keys on a key board, preferably equal in number to the total of characters on a printing wheel so that an operator depressing a key will thereby set into operation corresponding elements in the so called transmitter by reason of the electrical circuits illustrated to operate or set up other electrical circuits between the transmitter and the printing apparatus.

In said figure is illustrated but three of the thirty transmitting keys 220 for the alphabetical characters with special characters including the period key 222 provided for herein with but three transmitting keys 221 for the numerals, fractions thereof and special characters as the period etc., to a total of thirty, all to correspond to the total of thirty characters on each printing wheel 20 and 21 respectively. Any other number of keys may be employed provided,

nating the period keys are herein duplicated in each group 220 and 221 to provide for transmission operations to both said wheels 20 and 21 and for the stopping and unison or synchronizing position of said elements. This latter arrangement is one of convenience and not of necessity.

All of said keys are provided with the i usual stationary and movable contact points so well known that further description is unnecessary. In series with the stationary contact point for each key 220 a, b, c to 2,-

etc., by means of the lead wire 225 is a source of electrical energy herein illustrated by the battery 226. From the movable contact points are the lead wires 228 each being connected to a separate insulated segment or conductor .229 on the trailer disk 230 which is stationary.

From the moving contact on the keys 222 is connected the lead wire 231 in series with the relay 232 arid the stopping or synchronizing segment 233 which circuit d ffers from the above described circuits in this respect only.

The trailer disk 230 being stationary the rotating trailer 236 cooperating therewith and secured to the shaft 235 is adapted to contact with the segments 229 and 233 to provide a circuit. to the stopping ratchet wheel 238 having in contact therewith the collector brush 239. From said brush to the relay 241 is the lead wire 240 and from the relay 241 is the lead wire 242 connected to the relay 244 in series with the relay 245 by means of the lead wire 243. From the relay 245 to the batteries 226 is connected the lead wire 250 to complete the circuit Connected between the relays 244 and 245 to the lead wire 243 is the lead wire 247 connected to the source of electrical energy herein illustrated by the batteries 248 which latter are connected to the fixed contact points on the keys 221 and 222 by means of the lead wire-249.

The relays 244 and 245 are adapted to operate the press magnets 27 and 28 to shift the selector roll 143 from one to the other of the platen rolls 24 and 25 and also to attract the armature 151 to cause one of the said rolls to bring'one edge of the tape 29 into contact with one of the printing wheels 20 or 21. To accomplish the latter functions the relays 244 and 245 are provided with the armatures 252 and 253 in series circuit one with the other and adapted to engage the fixed contact points 256 for the former and both 257 and 258 for the latter. From the opposite ends of the source of en ergy 260 to the said contact points 257 and 258 are the lead wires supplying current to the press magnets 27 and 28.

Midway of the said source of energy 260 is connected the lead wire 261 joined to the lead wire 17 6 from the press magnet 27 which is in series circuit with the press magnet 28 having the lead wire 177 in circuit with the line wire 263 connected to the fixed contact point 256. Therefore the polarity of the circuit may be changed by the armature 253 contacting with the opposite ends of the batteries 260. Other magnets 27 and 28 may be joined in the last stated circuit at the point 262 in which event all press magnets will be in series one with the other. Thus all printing apparatus in said circuit will op.- erate simultaneously.

Cotiperating with the relay 232 is the armature 265 in series withthe magnet 85 by means of the lead wires 266 and 130. The magnet 85 is in series with the magnet 86 and from the latter is connected the lead Wires 131 and 267 secured to the collector v brush 268 in continuous'contact with the distributer wheel 269 fast on the rotating shaft 235. Said wheel is provided with fifteen peripheral portions 270 of equal circumferential extent with the insulated members 271 to form a make and break peripheral surface on said wheel. In contact with this wheel are the offset current reversing v 86 may be connected in series to provide for simultaneous operation of other printing apparatus as described herein.

In the said figure the operator is assumed to have just depressed the left hand key 222 closing the circuit from the batteries 226 by way of the lead wires 225, 231 to the relay 232 and the segment 233. .The shaft 235 is now rotated by any suitable means and the instant that the trailer 236 engages with the said segment the circuit is completed through the same to the said shaft to the relay 241 immediately attracting to the latter the armature 280 to bring it against the proper ratchet tooth on the stopping wheel 238 arresting the rotation of the wheel and the shaft 235. During this time the cirthereto the armatures 252' and 253 respec-.

tively causing them to engage with their cooperating contact points 256 and 257 to close the circuit .of one polarity or from one side of the batteries 260 thereby energizing both press magnets 27 and 28 with a corresponding polarity. The polarized armature 169 is attracted instantly to the pole 172 on the magnet 27 causing the former to snap into the dotted line position in said figure bringing with it the selector roll 143 so that the latter is in coperation with the roll extension on the platen roll 24.

The armature 169 beingpolarized it responds more quickly to any magnetic condition or polarity of the poles 172 and 173 than if not so polarized. Therefore said ar mature is attracted to the pole 172 more 265 when the relay quickly than thearmature 151 is attracted v on the lnner rent is now .teries 275 and the magnets 85 and 86 and back throughthe distributer wheel 269 to said batteries. At this time the rotation of the distributer wheel has been arrested with the brush 272 in engagement with one of .theperipheral portions 270 and the polarity of the magnets is'determined by the connections and the polarity of the left hand end of the said batteries 275. As no curpassing through the shunt coil 278 excess amperage is passing over the circuit and the armature 117 is immediately attracted to the pole 125 to bring the stud 115 downward and away from the notch 111 into thedotted line position while at the same time the armature 80 is arrested in its movement and the shaft 22 has rotated and is now stopped with the.period character in alinement with the platen roll 24.

If the stop 100 has not previously engaged with the arm 69 the. latter will now abut against the end of said stop as before described. If at this time the said stop was projecting into the path of movement of said arm the downward movement of the stud 115 would have been such as to cause the latter to engage with the cam surface 120 and thereby withdraw the stop 100 from said path of rotation allowing the arm 69 to rotate slightly when it will come to rest in the said abutting elements will again be synchronized.

Having synchronized all printing elements the operator is now ready to start transmitting alphabetical and numerical characters and will continue the same until during the course of transmitting a period is required when the key 222 will be operated and if any one printing apparatus has not operated synchronously just previously such apparatus willbecome synchronized again.

The operator now depresses one ofthe 220 keys, for example, the key 220 thereby closing the circuit between the batteries 226 and the a, segment 229. When the trailer 236 comes in contact with said segment the current again passes to the relays 241, 244 and 245 again causing the operations as before described. The armature 169 remains in'the last stated position with the selector roll 143 in position to co6perate with the platen roll 24 and the armature 151 will be attracted to the magnets 27 and 28. While the above operations were taking place the shaft 235 was rotating until the trailer 236 engaged the aforesaid segment 229.- The distributer wheel 269 was also presenting the portions 270 one after the other to' the brushes 272 and 273 thereby taking current first from one side and then the other of the batteries position and the printing ately' closing the clrcult between 275 changing the polarity of said current with each change of contact. The said alternated current passes over the lead wire 276 theshunt resistance 278 to the lead wire 266, the magnets 85 and 86 returning by way of the lead wire 267 to said distributer wheel 269 in one instance and asses over the same circuit in the reverse direction in the next instance. It will be noted that the armature 265 was not operated at the time of depressing the key 220 and therefore the former did not engage the contact point 277. Therefore the armature 117 remains in position with'the stud 115 in the notch 111. The armature 80 is attracted first to one magnet and then to the other as the polarity of the magnets 85 and 86 is changed thereby ratcheting the shaft 22 rapidly until the armature 280 was attracted by the relay 241 to stop the rotation of the shaft 235 and the destributer wheel 269. At this instant the armature 151 is attracted to the magnets 27 and 28 and the printing wheel 20 having stopped with the letter a in alinement with the platen wheel 24 said character is impressed on the inner margin of the tape 29. The key 220 having been released all the elements immediately resume their normal positions and the shaft 235 immediately starts to rotate again.

It will now be assumed that the operator has reached a point in transmitting where it is necessary to impress a numeral on the tape-29. The operator depresses one of the keys 221, for example, the key 221 immedithe relays 241, 244 the lead wire 247'to the batteries 248 thence byway of the lead wire 249 to the segment 229 corresponding to the numeral 1. When the trailer 236 has rotated to engage said segment the armature is attracted to the relay 241 stopping both the trailer and the shaft 235. The relay 245 not beneath the extension on the platen roll 25.

Instantly following the latter movement the armature 151 is attracted to the said magnets 27 and 28 to bring the outer edge of the tape 29 against the printing roll 21.

The distributer wheel 269 having been ro- Jtating until the shaft 235 was arrested in its movement thearmature 80 was attracted first to one and then tothe other of the magnets 85 and '86 ratcheting the shaft 22 until the position thereof brought the numeral 1 into alinement with the platen betical character the current passes over the resistance coil 278 and not by way of the armature 265 which is out of contact wlth the contact point 277. The armature 117' also remains in the normal position with the stud 115 engaging the notch 111 until such time as the armature 265 engages the contact point 277 when the resistance coil 278 is then shunted from the circuit and the excess amperage excites the magnets 85 and 86 to pull said armature 117 against the pole 125.

This latter operation is performed only when a key 222 is depressed to print a period and if any printing elements are not at this time in unison they will become synchronized by the means hereinbefore described.

At the point 279 other sets of printing wheel operating magnets 85 and 86 may be connected into the circuit and they will operate simultaneously with the similar magnets herein illustrated. If one set of printing apparatus is not operating synchronously with the remaining sets or with the transmitting elements, of if all sets of printing elements become in any way unsynchronized with the transmitting elements all stops 100 will operate to arrest all arms 69 until one of the keys 222 is depressed to operate the armatures 117 to immediately withdraw said stops from said arms and all printing elements will become synchronized as described.

We have described one embodiment of our invention; but it is to be understood that the latter is not limited to the specific construction and organization of said embodiment, since the same may be varied without departing from the proper scope of the claims.

Claims.

1. In a telegraph printing apparatus, a character printing wheel, a shaft therefor having a ratchet and sleeve surrounding a portion thereof and revoluble thereon, an escapement wheel revoluble on said shaft, a collar fixed to said shaft between said sleeve and said escapement wheel adapted to cooperate with the latter, and a shaft driving spring secured to said sleeve and to said collar.

2. In a telegraph printing apparatus, a character printing wheel and a shaft therefor, a driving sleeve rotatable on said shaft and yielding means connecting both for yieldingly rotating the shaft, an escapement wheel rotatable on said shaft, and yielding means interposed between said shaft and the escapement wheel to yieldingly rotate the latter.

3. In a telegraph printing apparatus, 21

character printing wheel and shaft therefor, a ratchet rotatable on said shaft, yielding means interposed between said ratchet and said shaft to yieldingly rotate the latter, an escapement wheel rotatable on said shaft, and yielding driving means interposed between said escapement wheel and said shaft to yieldingly rotate the former.

4;. In a telegraph printing apparatus, a character printing wheel, yielding driving means for rotating said wheel, an escapement wheel controlling the rotative movement of said character printing wheel, and yielding driving means interposed between said character printing wheel and said escapement wheel to yieldingly rotate the latter.

5. In a telegraph printing apparatus, a character printing wheel and a-shaft therefor, ratchet driving means rotatable on said shaft, a collar fixed to said shaft, yielding means interposed between said ratchet and said rollar, an escapement wheel yieldingly driven by said ratchet, and means determining the limit of movement of the said escapement wheel relative to said shaft.

6. In a telegraph printing apparatus, a character printing wheel and a shaft therefor, ratchet driving means for said shaft, a collarv fixed to said shaft, yielding driving means between the ratchet and said collar, limiting means between the ratchet and said collar to limit the relative yielding movement therebetween, an escapement wheel yieldingly driven by said shaft and means limiting the relative yielding movement between the said escapement wheel and the said shaft.

7. In a telegraph printing apparatus, a character printing wheel and a shaft therefor, ratchet driving means rotatable on said shaft and yieldingly connected thereto,

pawls cooperating with said ratchet, electromagnets for actuating said pawls and means cooperating with the electro-magnets to arrest the movement of said shaft.

8. In a telegraph printing apparatus, a character printing wheel, yielding driving means operated by electromagnets to rotate said character printing wheel, an escapement wheel and yielding driving means interposed between said character printing wheel and said escapement wheel to yieldingly drive the latter.

9. In a telegraph printing apparatus, a character printing wheel, yielding driving means operated by electromagnets to rotate the character printing wheel, an escapement wheel having yielding driving means interposed between the same andthe character printing wheel, mechanism for arresting rotation of said character printing wheel, and means controlled by said electromagnets for releasing said arresting mechanism from said characterfprinting wheel.

l0. In a telegraph printing apparatus, a character printing wheel, electrically operated yielding means for rotating said character printing wheel, an escapement wheel yieldingly driven by the character printing wheel and mechanism operated by the electrical means for maintaining synchronous movement of said character printing wheel.

11. Ina telegraph printing apparatus, a character printing wheel, electrically operated yielding driving means for rotating said character printing wheel, an escapement wheel yieldingly driven by the said printing wheel, and mechanism operated by said electrical means for maintaining synchronous movement of said yielding driving means for said character printing wheel. u

12. In a telegraph printing apparatus, a character printing wheel, electrically I op;- erated yielding driving means for rotating said printing wheel, a yieldingly operated escapement wheel connected to the printing wheel, means connected with said printing wheel to engage a movable stop and stop restoring means operated by said electrically operated means.

13. In a telegraph printing apparatus, a character printing wheel, electrically operated yielding means for rotating said wheel, means connected with said wheel to engage a movable stop, a restoring cam for said stop and means operated by said electrically operated means to engage said cam to move the same.

14. In a telegraph printing apparatus, a character printing wheel, electrically operated means for rotating said wheel, an arm connected with said wheel and adapted to abut against the end of a stop when the latter is operating in unison with the electrically operated means and mechanism controlled by said electrically operated means permitting said stop to project within the path of movement of the arm when the said wheel is not operating in unison with the said electrically operated means.

15. In a telegraph printing apparatus, a character printing wheel, electrically operated means for rotating said wheel, an

arm connected with said wheel and adapted to abut against the end of a stop when said wheel is synchronized with the electrically operated means, a stop and a member to position the same and mechanism operated by said'electricallyoperated means to disengage from said member when said arm abuts the end of said stop and to engage the member when said arm is rotating.

16. In a telegraph printing apparatus, a character printing wheel, an arm connectedwith said wheel and adapted cooperate and a restoring cam surface, electrically operated means adapted to rotate said wheel and said arm, and mechanism operated by said electrically operated means adapted to engage a notch to permit said arm toabut the end of the stop and to engage the cam when said arm is arrested by the stop to withdraw the-same from the path of the arm.

17. In a telegraph printing apparatus, a character printing wheel, an arm connected with said wheel and adapted to cooperate with a movable stop, a stop having a positioning member with positioning notches and a restoring cam surface, electrically op-= erated yielding means adapted to rotate said wheel and said arm and mechanism operated by said electrically operated means adapted to engage a notch to position the stop to abut said arm and to engage the said cam when the arm is arrested by the stop to withdraw the latter from the path of rotation of said arm.

18. In a telegraph printing apparatus, a character printing wheel and a synchronizing arm for the same, a stop to cooperate with said arm and having a positioning member with a plurality of positioning notches and a restoring cam surface, mechanism adapted to engage one of the notches to maintain said stop from the path of rotation of said arm and to engage another notch to maintain the stop within the path ofrotation of the arm and to engage the said cam to restore said stop to the normal position out of the path of rotation of the arm.

19. In a telegraph printing apparatus, a character printing wheel, a synchronizing arm connected to said wheel, a stop having a positioning member with a positioning portion and a cam surface, a spring adapted to-move said stop into the path of rotation of the arm, mechanism to engage the said positioning portion to maintain the stop in the normal position out of the path of rotation of the arm and to engage said cam surface to. restore said stop to the normal position when acted upon by said spring.

20. In a telegraph printing apparatus, a character printing wheel having a synchronizing arm connected therewith, electrically operated means for rotating said wheel and said arm, a stop having a member with a positioning portion and a cam surface, a resilient member adapted to move said stop within the path of rotation of said arm, mechanism operated upon intermittently by said electrically operated means to engage said positioning portion when the stop is in the normal position out of the path of rotation of said arm and to engage the said cam surface to move the positioning portion into cooperation with said mechanism when electrical means operating a rotatable character printing wheel, means rotating with said wheel for engaging a stop to arrest the rotation of the wheel, resilient means to move said stop into engagement with said arresting means and means operated by said electrical means operating said printing and electrically operated selective means adapted to move into cooperative relation with one platen roll' and operated by the same electrical means to thereafter engage with the platen roll support to move the platen roll toward the printing wheel.

24. In a telegraph printing apparatus, a plurality of yieldingly rotated printing wheels, a platen roll for each of said wheels, a selector roll and electrically operated .neans adapted to move the selector roll into cooperation with one of the platen rolls and subsequently lift the same into engagement with the printing wheel therefor.

25. In a telegraph printing apparatus, a plurality of yieldingly rotated printing wheels, a platen roll for each of said wheels and electrically operated means adapted to first select and subsequently elevate one of the said platen rolls into printing engagement with the printing wheel therefor.

26. In a telegraph printing apparatus, a yieldingly rotated printing wheel and an escapement wheel yieldingly rotated thereby and electromagnetic means for rotating the printing wheel and yieldingly rotate the said escapement wheel relative to said shaft.

27. In a telegraph printing apparatus, a propulsion shaft, a printing wheel .and an escapement wheel yieldingly rotated thereby on said shaft and electromagnetic means for rotating said shaft and for yieldingly ac-.

tuating said escapement wheelrelative to said shaft.

28. In a telegraph printing apparatus, a propulsion shaft having aprinting wheel secured thereto, an escapement wheel rotatable on said shaft, yielding means for rotating said shaft and for yieldingly rotating said escapement wheel relative to said shaft and electromagnetic means for rotating said yielding means and for actuating said escapement wheel.

secured thereto, an escapement wheel rotatable on said shaft,'yielding means on the shaft for propelling the same and for yieldingly rotating the escapement wheel relative to the shaft, electromagnetic means for rotating said yielding means and for actuating the escapement wheel and means operated by the electromagnet means for arresting the rotation of the shaft and the escapement wheel.

30. In a telegraph printing apparatus, a rotatable shaft having a printing wheel secured thereto, an escapement wheel rotatable on said shaft and electrically operated yielding driving means for rotating said shaft and said escapement wheel and permitting one of the latter to advance its rotation relative to the other.

31. In a telegraph printing apparatus, a rotatable shaft having a printing wheel secured thereto, a ratchet sleeve rotatable within limits upon one end of said shaft, a collar secured to said shaft, a spring surrounding said sleeve and secured to the same and to the collar, an escapement wheel rotatable on said shaft and means on said collar to limit the relative movement of the escapement wheel. 96

32. In a telegraph printing apparatus, a rotatable shaft having a printing wheel secured thereto,, a ratchet sleeve rotatable within limits upon one end of said shaft,

a collar secured to said shaft, a spring sur- 100 rounding said sleeve and secured to the same and to the collar, an escapement wheel rotat-able on said shaft, resilient means between said collar and said escapement wheel to rotate the latter and means operated electrically for rotating said ratchet sleeve and for arresting the rotation of the shaft.

33. In a telegraph printing apparatus, a character printing wheel and a shaft therefor, driving means rotatable on said shaft and yieldingly connected thereto to yieldingly drive the same, an escapement wheel on said shaft and yieldingly driven thereby, electromagnetie means and mechanism therefor engaging both the said driving means and said escapement wheel to rotate said shaft in a step by step movement.

34. In a telegraph printing apparatus, a character printing wheel and a shaft therefor, driving means rotatable on) said shaft p the movement of the shaft.

v 365,004 ml 35. In a telegraph printing apparatus, a for controlling said electrically operated character printing wheel, electrically operdriving means. ated driving means yieldingly connected In testimony whereof We have signed our thereto and operating a yieldingly connected names to this specification.

5 escapement Wheel cooperating with the said ANDREW T. MACCOY.

driving means and. circuit operating means ROY F. ALLEN. 

